This may take some thought and certainly, should be based on the research you have done on the organization. Sincerity is extremely important here and will easily be sensed. Relate it to your long-term career goals.
I whant to work with your group because your company is rising and reputed and i am also want to be a part of this company. My motto of life is not only Dosh but i what to be a public figure and want to feel proud while telling to others about my working company. I have read more about this company this company provide good salary and incentive so that a worker toil for work. About my self i am a self motivated and hard working person. I am honest and humble and always try to be worthy for this company as possible. my dream is to give my all skills and astutes for your communication. so that not only i while my working company will get sucess